Mold.



yPATEN'IED JULY 9, 1907. G. W. STEVENS. MOLD.

APPLICATION FILED 11411.22, 1905.

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MOLD.

Specification of Letters Patent.

Patented July 91907.

Application filed March 22, 1905. Serial No. 251,376.

To all whom it may concern:

Be it known that I, Gnonen W. STEVENS, a citizen of the United States, residing at No.1 Lawrence street, Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Molds, of which the following is a specification.

My present invention relates to improvements in molds, and the main object of my invention, is the provision of a mold, by the use of which a strong and ornamental cement concrete wall may be built, the mold being provided with a removable means whereby the coarser material of the wall can be simultaneously faced with a finer material of any desired color or thickness, either to represent various kinds of stone in blocks, or an entirely smooth faced wall, as may be desired.

To this end, I first lay the concrete footers of the walls, and place a frame-work of pipes so as to be in the center of the concrete wall when finished, the first section of the mold being placed upon the footers with the finish separating plates the desired distance from the front or forming plate of the mold. To the rear of the finish7 plate, is filled in the coarser concrete to the desired height, while between the finish and the forming plate is filled in the finish concrete, which contains enough cement, so that when the iinish plate is removed from the concrete the finish will adhere or coalese to the coarser concrete, the two being properly tamped after the finish plates are removed. The forming7 plate and rear plate of the mold, are not removed until the section of the wall is set, but during such setting, other molds may be placed above and the operation of forming the different layers continued.

To more clearly illustrate the operation and construction of my improved mold, I invite attention to the accompanying drawings, in which,-

Figure l is a front elevation of my mold, Fig. 2 is a cross section of the mold ready `to be filled, and Figs. 3, and 4 are detail views of various parts.

In the said drawings,-A designates the concrete footer or foundation, which supports the frame B, of gas pipes or the like, which provide a net-work to assist in supporting the concrete wall to be built by my mold upon the footeix The mold, proper consists of the rear or inside plate l, and the front or forming plate 2, the rear plate being constructed with a series of openings through which are adapted to passthe fastening bolts 3, the said bolts being threaded on both ends so that the forming77 and rear plates may be removed after the wall is set, leaving the bolts in the wall.

The forming plate 2, has removably secured to the upper edge thereof, the guide strip 4, which when the two plates are secured in position, as shown in Fig. l, is adapted to gage the amount of finish concrete to be filled into the mold, and when the concrete has reached the proper height, the strip 4- is removed, so that other sections of the mold may be placed upon the lower section, and the operation of form ing another section of wall continued.

In order to hold the two plates parallel, I employ the braces 7, which are secured to the top of the plates and to the frame B, above the level of the concrete within the mold, so that after the mold is filled, these braces may be removed.

In order to separate the eoarser concrete from the iinish, I employ the removable metal plate 8, provided with the steadying and strengthening strip 9, near the lower edge upon the rear face thereof, the said strip being removably secured to the plate 8, b3 means of bolts 9, carrying washers 9b, the said plate 8, being further provided with handles 10, by means of which the same is removed after the finish concrete has been filled in between it, and the forming plate and the coarser concrete has been filled in between the plate 8, and the rear plate l. The bolts 3, are so mounted as to lie between the ends of adjacent plates 8, so as not to interfere with the removal of said plates 8. The plates 8 and 9 are removed while the concrete is soft and. just after the coarsevconcrete has been filled to about the height shown in Fig. 2, the plate 8 being held against the sand finish until the remainder of the coarse concrete has been filled to the top of the boards l and 2, after which the boards 8 and 9 are removed. The advantage of the strengthening plate 9, is in the withdrawing of the plate 8, a slight reciprocating movement has to be imparted to spread the material apart so that the plates can be removed; and it was during this operation that thelower portion of the plate 8 would either bend, if made of metal, or split and break, if made of Wood. The plate 9 provides against this.

Upon the inner face of the forming plates may be provided any design to produce either a rough or a smooth stone finish; and should it be desired to pro- What I claim as new and desire to secure by Letters the .Plate by SRlCe mells holding the Pllte and Strips P t t seperated, and handles connected to the plate, for the purl0 a en 1S pose set forth.

In combination with a mold in which rough concrete v In testimony whereof I hereto atlx my signature in pres and a sand nish cement is adapted to he molded, of a reence of two Witnessesmovable separator for holdingftheY snd nish during the GEORGE W. STEVENS filling of the mold, consisting of a plate, a. steadying and Witnesses; strengthening strip secured to and in the rear of said C- Q FISHER,

plate near the lower portion thereof, and separated from M. l KILLIAN. 

